Ah, the "probably" stickers/t-shirts/bookmarks... - never did buy one 
Anyway, I'm back off holiday and finding that the thread is moving on - hello again.
DS went into college today & agreed with his teachers that he's dropping Comp Sci, since he only got a D for that at AS. That leaves him with Physics (with resits), Maths (possibly also resits) and Further Maths. He says he's happy with that, and seems less stressed than he has been since results day.
What I don't really know, not having been here before, is what the effect of poor AS grades is on his application. I'm guessing that with B (A level) & C, D (AS) he's unlikely to get offers from anywhere that asks for AAA, so he'll need to look for lower requirements, but how much lower? Is BBB likely to be out of court too - he & his teachers think that's a reasonable target at the moment?
I'm hoping that now he's sorted what he's doing this year I can actually get him moving on applications - he hasn't even signed up for UCAS yet, or any open days, let alone start on his PS. He's back at college tomorrow, so I'm hoping they'll do a bit of pushing from their end!